<!DOCTYPE html>
<html>
   <head>
      <meta charset="UTF-8">
      <title>消息对话框4</title>
      <script src="event.js"></script>
   </head>
   <body>
     <button onclick="onClick_MessageBox()">显示简单的消息对话框</button>
     <p/>
     <button onclick="onClick_MessageBoxIcon()">定制消息对话框的图标</button>
     <p/>
     <button onclick="onClick_MessageBoxType()">设置消息对话框的类型</button>
     <p/>
     <button onclick="onClick_MessageBoxMultiButtons()">为消息对话框设置多个按钮</button>
     <p/>
     <label id='label'></label>
   </body>
</html>
